By: Tyler Griffin
First setup your family table within your part (or parts). Next at the assembly level click on the family table icon and then click to add an item to the family table. Select Component for the type and select the part that you want to add to the family table (the part that you have multiple instances of).
Then, select this icon: , to add rows to the family table. Select the cell within the column for the part you've added to the table and the new row you've added. Select Tools -> Replace Using -> Family Member.
For more on assembly family tables check out our Creo 3.0 Advanced Assembly class!